Oil ring for pistons



Jan; 17, 1933. F. DEUTSCH 1,894,672

QIL RING FOR PISTONS Filed Sept. 14, 1931 Inf/v7 [F7772 50 Ja'fl Patented Jan. 17, 1933 UNITED STATES PATENT OFFICE FRITZ DEUTSCH, OF MEMPHIS, TMKESSEE OIL RING FOB PISTONS Application filed. September 14, 1931. Serial No. 562,700.

' In oil rings for pistons it has long been customary to channel out grooves or pockets of various types in .the peripheral wall of the ring and to connect these grooves or channelways by holes or slots leading radially inward through the inner wall of the ring.

.Such construction appeared to be satisfactory, but it soon developed that the thin side walls of these grooves were extremely fragile, and because of the relatively greatly decreased cross section of the ring wheredrain openingsled from the outer groove to the interior there was a tendency for the ring to assume a polygonal form rather than a perfect circle, not only causing unequal pressures and wear on the cylinder wall but exerting a disrupting strain on the thin side walls at such sections, which tended to destroy the ring.

The objects of the present construction are primarily to increase the cross section of the ring at that point which has previously been the weakest; to brace the fragile side walls at their weakest points; to reduce the length of span of such fragile sections; and to average up the cross sectional areas to as great an extent as'possible to form a perfect circle ring. The means by which the foregoing and other objects are accomplished and the manner of their accomplishment will readily be understood from the following specification on reference to the accompanying drawing, in which Fig. 1 is a side elevation of a ring partially in section;

Fig. 2 is an edge or face view of the ring;

Figs. 3, 4 and 5 are respectively enlarged sections on the lines III- III; IVIV' and VV of Fig. 1; and

Fig. dis a modified form of the device.

Referring now to the drawing in which the various parts are indicated by numerals, 10 are arcuate grooves or pockets in pairs, channeled in the face of the ring, the grooves "Iyin'g laterallybetween thin side walls 11.

the ring and the other of said ri the circumference of the ring by transverse ridges or peaks 12, which ridges lie fiush'with the outer circumference of the ring, and similarly the two grooves of each pair are separated by a transverse ridge 13. The ring is cut through between each pair of peaks 12 by a drain slot 14 which extends through to the interior of the ring and is essentially much narrower than the pockets 10. These slots 14 are symmetrical about and cut through the peaks 13 so that the fragile side walls 11 of the ring are reinforced opposite the longitudinal center point of the slots by thickened portions which culminate in their greatest depth at the peaks 18, and at the center of the slot.

By this construction I obtain a maximum scraping surface for the removal of oil from the cylinder wall with all the advantages of v generous oil drain slots and yet obtain a maximum lateral strength of side wall, and a truss efi'ect having greatest strength atthe center of the slot.

It will readily. be seen that the resulting ring accomplishes substantially a perfect circle and is materially strengthened without sacrifice of oil stripping action.

It will be noted that the pockets 10 are arcuate grooves, and that such construction permits a minimum length of pocket. This makes it possible in some cases to accomplish a similar result by providing each arcuate pocket 10 with a drain opening 14A leading from the lowest point of the pocket through the inner wall of the ring as shown in Fig. 6.

Having described my invention, what I claim is 1. A piston ring having a plurality of substantially concave pockets in the outer face thereof forming parallel cylinder contacting edge portions, and. a ridge portion formed I between and'separating each of the adjacent pockets and extending outwardly to the outer face of said ring, alternate of said ridges being provided with a slot extendin through es being each provided on their opposite sides with a pocket extending into adjacent of said slots.

2. A piston ring having a; plurality of subm0 thereof forming arallel cylinder contacting edge portions, anfi ridge (portions formed be tween and separating a jacent pockets and extending outwardly to the outer face of said alternate of said ridges being provided w i ti a slot extending through the ring.

3. A' piston ring having a plurality of substantlall concave pockets inthe outer face-thereo forming parallel cylinder contactin edge lgartions, and ridge portions, each ormed tween and separating adjacent pockets and extending outwardl to the face of saidrin alternate of sai ridges being cut in two y a slot extending through the ring-said slot connecting two pockets and extending at least to the centers of such PQQ In testimony whereof I hereunto aflix my signature. s

. FRITZ DEUTSCH. 

